UNDERSTANDING POLITICAL POLLS- IVEY CASE STUDY

please answer these from case study

In particular he asked for answers to the following questions.

1. The Ontario poll has 940 people, whereas the national poll had 2,638 people. Why this difference? How does the smaller sample size affect the results? How can the pollsters still be confident the poll is right 19 times out of 20?

2. The journalist said that support drops off dramatically after age 65. Do you agree with this statement? If not, why is the statement wrong?